EL2360C
June
1996
Rev
A
EL2360C
Triple 130 MHz Current Feedback Amplifier
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ``controlled document'' Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1996 Elantec Inc
Features
Triple amplifier topology
130 MHz
b
3 dB bandwidth
(A
V
e a
2)
180 MHz
b
3 dB bandwidth
(A
V
e a
1)
Wide supply range
g
2V to
g
15V
80 mA output current (peak)
Low cost
1500 V ms slew rate
Input common mode range to
within 1 5V of supplies
35 ns settling time to 0 1%
Available in single (EL2160C)
dual (EL2260C) and quad
(EL2460C) form
Applications
RGB amplifiers
Video amplifiers
Cable driver
Test equipment amplifiers
Current to voltage converters
Video broadcast equipment
Ordering Information
Part No
Temp Range
Package
Outline
EL2360CN
b
40 C to
a
85 C 16
b
Pin PDIP MDP0031
EL2360CS
b
40 C to
a
85 C 16
b
Pin SOIC MDP0027
General Description
The EL2360C is a triple current-feedback operational amplifier
which achieves a
b
3 dB bandwidth of 130 MHz at a gain of
a
2 Built using the Elantec proprietary monolithic comple-
mentary bipolar process these amplifiers use current mode
feedback to achieve more bandwidth at a given gain than a
conventional voltage feedback amplifier
The EL2360C is designed to drive a double terminated 75
X coax
cable to video levels It's fast slew rate of 1500 V
ms combined
with the triple amplifier topology makes its ideal for RGB vid-
eo applications
This amplifier can operate on any supply voltage from 4V
(
g
2V) to 33V (
g
16 5V) yet consume only 8 mA per amplifier
at any supply voltage The EL2360C is available in 16-pin
PDIP and SOIC packages
For Single Dual or Quad applications consider the EL2160C
EL2260C or EL2460C all in industry standard pin outs For
Single applications with a power down feature consider the
EL2166C
Connection Diagram
EL2360C SOIC P-DIP
Packages
2360 1
Top View
EL2360C
Triple 130 MHz Current Feedback Amplifier
Absolute Maximum Ratings
(T
A
e
25 C)
Voltage between V
Sa
and V
Sb
a
33V
Common-Mode Input Voltage
V
Sb
to V
Sa
Differential Input Voltage
g
6V
Current into
a
IN or
b
IN
g
10 mA
Internal Power Dissipation
See Curves
Output Current (continuous)
g
50 mA
Operating Ambient Temperature Range
b
40 C to
a
85 C
Operating Junction Temperature
150 C
Storage Temperature Range
b
65 C to
a
150 C
Important Note
All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually
performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test
equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore T
J
e
T
C
e
T
A
Test Level
Test Procedure
I
100% production tested and QA sample tested per QA test plan QCX0002
II
100% production tested at T
A
e
25 C and QA sample tested at T
A
e
25 C
T
MAX
and T
MIN
per QA test plan QCX0002
III
QA sample tested per QA test plan QCX0002
IV
Parameter is guaranteed (but not tested) by Design and Characterization Data
V
Parameter is typical value at T
A
e
25 C for information purposes only
DC Electrical Characteristics
V
S
e
g
15V R
L
e
150
X T
A
e
25 C unless otherwise specified
Parameter
Description
Conditions
Min
Typ
Max
Test
Units
Level
V
OS
Input Offset Voltage
V
S
e
g
5V
g
15V
2
10
I
mV
TCV
OS
Average Input Offset Voltage Drift (Note 1)
10
V
mV C
a
I
IN
a
Input Current
V
S
e
g
5V
g
15V
0 5
3
I
mA
b
I
IN
b
Input Current
V
S
e
g
5V
g
15V
5
25
I
mA
CMRR
Common Mode Rejection Ratio (Note 2)
V
S
e
g
5V
g
15V
50
55
I
dB
b
ICMR
b
Input Current Common
V
S
e
g
5V
g
15V
0 2
5
I
mA V
Mode Rejection (Note 2)
PSRR
Power Supply Rejection Ratio (Note 3)
75
95
I
dB
b
IPSR
b
Input Current Power
0 2
5
I
mA V
Supply Rejection (Note 3)
R
OL
Transimpedance (Note 4)
V
S
e
g
15V R
L
e
400
X
500
2000
I
k
X
V
S
e
g
15V R
L
e
150
X
500
1800
I
k
X
a
R
IN
a
Input Resistance
1 5
3
I
M
X
a
C
IN
a
Input Capacitance
PDIP package
1 5
V
pF
SOIC package
1
V
pF
CMIR
Common Mode Input Range
V
S
e
g
15V
g
13 5
V
V
V
S
e
g
5V
g
3 5
V
V
Note 1 Measured from T
MIN
to T
MAX
Note 2 V
CM
e
g
10V for V
S
e
g
15V V
CM
e
g
3V for V
S
e
g
5V
Note 3 The supplies are moved from
g
2 5V to
g
15V
Note 4 V
OUT
e
g
7V for V
S
e
g
15V V
OUT
e
g
2V for V
S
e
g
5V
2
TD
is
34in
EL2360C
Triple 130 MHz Current Feedback Amplifier
DC Electrical Characteristics
V
S
e
g
15V R
L
e
150
X T
A
e
25 C unless otherwise specified
Contd
Parameter
Description
Conditions
Min
Typ
Max
Test
Units
Level
V
O
Output Voltage Swing
V
S
e
g
15V R
L
e
400
X
g
12
g
13 5
I
V
V
S
e
g
15V R
L
e
150
X
g
12
V
V
V
S
e
g
5V R
L
e
150
X
g
3 0
g
3 7
I
V
I
SC
Output Short Circuit Current (Note 5)
V
S
e
g
5V
g
15V
60
100
150
I
mA
I
S
Supply Current (per amplifier)
V
S
e
g
15V
8 0
11 3
I
mA
V
S
e
g
5V
5 7
8 8
I
mA
Note 5 A heat sink is required to keep junction temperature below absolute maximum when an output is shorted
AC Electrical Characteristics
(Note 8) V
S
e
g
15V A
V
e a
2 R
F
e
R
G
e
560
X R
L
e
150
X T
A
e
25 C
unless otherwise specified
Parameter
Description
Conditions
Min
Typ
Max
Test
Units
Level
BW
b
3 dB Bandwidth
V
S
e
g
15V A
V
e a
2
130
V
MHz
V
S
e
g
15V A
V
e a
1
180
V
MHz
V
S
e
g
5V A
V
e a
2
100
V
MHz
V
S
e
g
5V A
V
e a
1
110
V
MHz
SR
Slew Rate (Note 6)
R
L
e
400
X
1000
1500
IV
V
ms
R
F
e
1 k
X R
G
e
110
X R
L
e
400
X
1500
V
V
ms
t
r
t
f
Rise Time Fall Time
V
OUT
e
g
500 mV
2 7
V
ns
t
PD
Propagation Delay
V
OUT
e
g
500 mV
3 2
V
ns
OS
Overshoot
V
OUT
e
g
500 mV
0
V
%
t
S
0 1% Settling Time
V
OUT
e
g
2 5V A
V
e b
1
35
V
ns
dG
Differential Gain (Note 7)
R
L
e
150
X
0 025
V
%
R
L
e
500
X
0 006
V
%
dP
Differential Phase (Note 7)
R
L
e
150
X
0 1
V
R
L
e
500
X
0 005
V
Note 6 Slew Rate is with V
OUT
from
a
10V to
b
10V and measured at
a
5V and
b
5V
Note 7 DC offset from
b
0 714V to
a
0 714V AC amplitude 286 mV
PbP
f
e
3 58 MHz
Note 8 All AC tests are performed on a ``warmed up'' part except Slew Rate which is pulse tested
3
TD
is
15in
TD
is
30in
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Response (Gain)
Non-Inverting Frequency
Response (Phase)
Non-Inverting Frequency
for Various R
L
Frequency Response
Response (Gain)
Inverting Frequency
Response (Phase)
Inverting Frequency
Various R
F
and R
G
Frequency Response for
Voltage for A
V
e
b
1
3 dB Bandwidth vs Supply
for A
V
e
b
1
Peaking vs Supply Voltage
Temperature for A
V
e
b
1
3 dB Bandwidth vs
2360 2
4
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
Voltage for A
V
e
a
1
3 dB Bandwidth vs Supply
for A
V
e
a
1
Peaking vs Supply Voltage
for A
V
e
a
1
3 dB Bandwidth vs Temperature
Voltage for A
V
e
a
2
3 dB Bandwidth vs Supply
for A
V
e
a
2
Peaking vs Supply Voltage
for A
V
e
a
2
3 dB Bandwidth vs Temperature
Voltage for A
V
e
a
10
3 dB Bandwidth vs Supply
for A
V
e
a
10
Peaking vs Supply Voltage
for A
V
e
a
10
3 dB Bandwidth vs Temperature
2360 3
5
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
for Various C
L
Frequency Response
for Various C
INb
Frequency Response
Isolation vs Frequency
Channel to Channel
vs Frequency
PSRR and CMRR
Distortion vs Frequency
2nd and 3rd Harmonic
vs Frequency
Transimpedance (R
OL
)
vs Frequency
Voltage and Current Noise
Impedance vs Frequency
Closed-Loop Output
vs Die Temperature
Transimpedance (R
OL
)
2360 4
6
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
(4 Samples)
vs Die Temperature
Offset Voltage
(Per Amplifier)
vs Die Temperature
Supply Current
(Per Amplifier)
vs Supply Voltage
Supply Current
vs Die Temperature
a
Input Resistance
vs Die Temperature
Input Current
vs Input Voltage
a
Input Bias Current
vs Die Temperature
Output Voltage Swing
vs Die Temperature
Short Circuit Current
vs Die Temperature
PSRR
CMRR
2360 5
7
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
R
L
e
150
vs DC Input Voltage
Differential Gain
R
L
e
150
vs DC Input Voltage
Differential Phase
Pulse Response
Small Signal
R
L
e
500
vs DC Input Voltage
Differential Gain
R
L
e
500
vs DC Input Voltage
Differential Phase
Pulse Response
Large Signal
vs Supply Voltage
Slew Rate
vs Temperature
Slew Rate
2360 6
8
EL2360C
Triple 130 MHz Current Feedback Amplifier
Typical Performance Curves
Contd
Settling Time vs
Settling Accuracy
2360 15
Long Term Settling Error
2360 16
16-Lead Plastic SO
Maximum Power Dissipation
vs Ambient Temperature
2360 7
16-Lead Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
2360 8
9
EL2360C
Triple 130 MHz Current Feedback Amplifier
Differential Gain And Phase Test Circuit
2360 9
Simplified Schematic (One Amplifier)
2360 10
10
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Product Description
The EL2360C is a triple current feedback ampli-
fier that offers wide bandwidth and good video
specifications at moderately low supply currents
It is built using Elantec's proprietary compli-
mentary bipolar process and is offered in both a
16 pin PDIP and SOIC packages Due to the cur-
rent feedback architecture
the EL2360C clo-
sed
b
loop
b
3 dB bandwidth is dependent on the
value of the feedback resistor First the desired
bandwidth is selected by choosing the feedback
resistor R
F
and then the gain is set by picking a
gain resistor R
G
The curves at the beginning of
the Typical Performance Curves section show the
effect of varying both R
F
and R
G
The
b
3 dB
bandwidth is somewhat dependent on the power
supply voltage
As the supply voltage is de-
creased internal junction capacitances increase
causing a reduction in the closed loop bandwidth
To compensate for this smaller values of feed-
back resistor can be used at lower supply volt-
ages
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high-frequency device good printed
circuit board layout is necessary for optimum
performance Ground plane construction is high-
ly recommended Lead lengths should be as short
as possible preferably below
'' The power sup-
ply pins must be well bypassed to reduce the risk
of oscillation The combination of a 1 0
mF tanta-
lum capacitor in parallel with a 0 01
mF ceramic
capacitor has been shown to work well when
placed at each supply pin
For good AC performance parasitic capacitance
should be kept to a minimum especially at the
inverting input (see the Capacitance at the In-
verting Input section) This implies keeping the
ground plane away from this pin Carbon or Met-
al-Film resistors are acceptable with the Metal-
Film resistors giving slightly less peaking and
bandwidth because of their additional series in-
ductance Use of sockets particularly for the SO
package should be avoided if possible Sockets
add parasitic inductance and capacitance which
will result in some additional peaking and over-
shoot
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or cur-
rent-feedback amplifier can be affected by stray
capacitance at the inverting input The character-
istic curve of gain vs frequency with variations
in C
IN
b
emphasizes this effect The curve illus-
trates how the bandwidth can be extended to be-
yond 200 MHz with some additional peaking
with an additional 2pF of capacitance at the
V
IN
b
pin For inverting gains this parasitic ca-
pacitance has little effect because the inverting
input is a virtual ground but for non-inverting
gains this capacitance (in conjunction with the
feedback and gain resistors) creates a pole in the
feedback path of the amplifier This pole if low
enough in frequency has the same destabilizing
effect as a zero in the forward open-loop re-
sponse The use of large value feedback and gain
resistors further exacerbates the problem by fur-
ther lowering the pole frequency
Feedback Resistor Values
The EL2360C has been designed and specified at
a gain of
a
2 with R
F
e
560
X This value of
feedback resistor yields relatively flat frequency
response with little to no peaking out to 130
MHz Since the EL2360C is a current-feedback
amplifier it is also possible to change the value
of R
F
to get more bandwidth As seen in the
curve of Frequency Response For Various R
F
and R
G
bandwidth and peaking can be easily
modified by varying the value of the feedback
resistor For example by reducing R
F
to 430
X
bandwidth can be extended to 170 MHz with un-
der 1 dB of peaking Further reduction of R
F
to
360
X increases the bandwidth to 195 MHz with
about 2 5 dB of peaking
Bandwidth vs Temperature
Whereas many amplifier's supply current and
consequently
b
3 dB bandwidth drop off at high
temperature the EL2360C was designed to have
little supply current variation with temperature
An immediate benefit from this is that the
b
3
dB bandwidth does not drop off drastically with
temperature With V
S
e
g
15V and A
V
e
a
2
the bandwidth varies only from 150 MHz to 110
MHz over the entire die junction temperature
range of
b
50 C
k
T
k
150 C
11
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Contd
Supply Voltage Range and Single Supply
Operation
The EL2360C has been designed to operate with
supply voltages from
g
2V to
g
15V Optimum
bandwidth slew rate and video characteristics
are obtained at higher supply voltages However
at
g
2V supplies the
b
3 dB bandwidth at A
V
e
a
2 is a respectable 70 MHz The following figure
is an oscilloscope plot of the EL2360C at
g
2V
supplies A
V
e a
2 R
F
e
R
G
e
560
X driving a
load of 150
X showing a clean
g
600 mV signal at
the output
2360 11
If a single supply is desired values from
a
4V to
a
30V can be used as long as the input common
mode range is not exceeded When using a single
supply be sure to either 1) DC bias the inputs at
an appropriate common mode voltage and AC
couple the signal or 2) ensure the driving signal
is within the common mode range of the
EL2360C which is typically 1 5V from each sup-
ply rail
Settling Characteristics
The EL2360C offers superb settling characteris-
tics to 0 1% typically in the 35 ns to 40 ns range
There are no aberrations created from the input
stage which often cause longer settling times in
other current feedback amplifiers The EL2360C
is not slew rate limited therefore any size step up
to
g
10V gives approximately the same settling
time
As can be seen from the Long Term Settling Er-
ror curve for A
V
e a
1 there is approximately a
0 035% residual which tails away to 0 01% in
about 40
ms This is a thermal settling error
caused by a power dissipation differential (before
and after the voltage step) For A
V
e b
1 due to
the inverting mode configuration this tail does
not appear since the input stage does not experi-
ence the large voltage change as in the non-in-
verting mode With A
V
e
b
1 0 01% settling
time is slightly greater than 100 ns
Power Dissipation
The EL2360C amplifier combines both high
speed and large output current capability at a
moderate supply current in very small packages
It is possible to exceed the maximum junction
temperature allowed under certain supply volt-
age temperature and loading conditions To en-
sure that the EL2360C remains within it's abso-
lute maximum ratings the following discussion
will help to avoid exceeding the maximum junc-
tion temperature
The maximum power dissipation allowed in a
package is determined according to 1
PD
MAX
e
T
JMAX
b
T
AMAX
i
JA
1
where
T
JMAX
e
Maximum Junction Temperature
T
AMAX
e
Maximum Ambient Temperature
i
JA
e
Thermal Resistance of the Package
PD
MAX
e
Maximum Power Dissipation
in the Package
The maximum power dissipation actually pro-
duced by an IC is the total quiescent supply cur-
rent times the total power supply voltage plus
the power in the IC due to the load or 2
PD
MAX
e
N (V
S
I
SMAX
a
(V
S
b
V
OUT
)
V
OUT
RL
)
2
where
N
e
Number of amplifiers
V
S
e
Total Supply Voltage
I
SMAX
e
Maximum Supply Current per ampli-
fier
V
OUT
e
Maximum Output Voltage of the Ap-
plication
R
L
e
Load Resistance tied to Ground
12
EL2360C
Triple 130 MHz Current Feedback Amplifier
Applications Information
Contd
If we set the two PD
MAX
equations
1 and 2
equal to each other and solve for V
S
we can get a
family of curves for various loads and output
voltages according to 3
V
S
e
R
L
(T
JMAX
b
T
AMAX
)
N
i
JA
a
(V
OUT
)
2
(I
S
R
L
)
a
V
OUT
3
The figures below show total supply voltage V
S
vs R
L
for various output voltage swings for the
PDIP and SOIC packages The curves assume
WORST CASE conditions of T
A
e
a
85 C and
I
S
e
11 3 mA per amplifier The curves do not
include heat removal or forcing air or the simple
fact that the package will be attached to a circuit
board which can also provide some form of heat
removal Larger temperature and voltage ranges
are possible with heat removal and forcing air
past the part
Supply Voltage vs R
L
for Various V
OUT
(PDIP Package)
2360 12
Supply Voltage vs R
L
for Various V
OUT
(SOIC Package)
2360 13
Current Limit
The EL2360C has internal current limits that
protect the circuit in the event of an output being
shorted to ground This limit is set at 100 mA
nominally and reduces with the junction temper-
ature At T
J
e
150 C the current limits at about
65 mA If any one output is shorted to ground
the power dissipation could be well over 1W and
much greater if all outputs are shorted Heat re-
moval is required in order for the EL2360C to
survive an indefinite short
Driving Cables and Capacitive Loads
When used as a cable driver double termination
is always recommended for reflection-free per-
formance For those applications the back-termi-
nation series resistor will de-couple the EL2360C
from the cable and allow extensive capacitive
drive
However
other applications may have
high capacitive loads without a back-termination
resistor In these applications a small series resis-
tor (usually between 5
X and 50X) can be placed
in series with the output to eliminate most peak-
ing The gain resistor (R
G
) can then be chosen to
make up for any gain loss which may be created
by this additional resistor at the output In many
cases it is also possible to simply increase the val-
ue of the feedback resistor (R
F
) to reduce the
peaking
13
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
EL2360C Macromodel
Revision A June 1996
AC characteristics used Rf
e
Rg
e
560 ohms
Pin numbers reflect a standard single opamp
Connections
a
input
l
b
input
l
l
a
V
supply
l
l
l
b
V
supply
l
l
l
l
output
l
l
l
l
l
subckt EL2360 EL
3
2
7
4
6
Input Stage
e1 10 0 3 0 1 0
vis 10 9 0V
h2 9 12 vxx 1 0
r1 2 11 130
l1 11 12 25nH
iinp 3 0 0 5
mA
iinm 2 0 5
mA
r12 3 0 2 Meg
Slew Rate Limiting
h1 13 0 vis 600
r2 13 14 1K
d1 14 0 dclamp
d2 0 14 dclamp
High Frequency Pole
e2 30 0 14 0 0 00166666666
l3 30 17 0 43
mH
c5 17 0 0 27pF
r5 17 0 500
Transimpedance Stage
g1 0 18 17 0 1 0
rol 18 0 2Meg
cdp 18 0 2 285pF
Output Stage
q1 4 18 19 qp
q2 7 18 20 qn
q3 7 19 21 qn
q4 4 20 22 qp
r7 21 6 4
r8 22 6 4
ios1 7 19 2mA
ios2 20 4 2mA
Supply Current
ips 7 4 2 5mA
Error Terms
ivos 0 23 2mA
vxx 23 0 0V
e4 24 0 3 0 1 0
e5 25 0 7 0 1 0
e6 26 0 4 0
b
1 0
r9 24 23 562
r10 25 23 1K
r11 26 23 1K
Models
model qn npn(is
e
5e
b
15 bf
e
100 tf
e
0 1 ns)
model qp pnp(is
e
5e
b
15 bf
e
100 tf
e
0 1 ns)
model dclamp d(is
e
1e
b
30 ibv
e
0 266
a
bv
e
2 24v n
e
4)
ends
14
TD
is
48in
TD
is
51in
EL2360C
Triple 130 MHz Current Feedback Amplifier
EL2360C Macromodel
Contd
2360 14
15
EL2360C
June
1996
Rev
A
EL2360C
Triple 130 MHz Current Feedback Amplifier
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown Elantec Inc reserves the right to make changes
in the circuitry or specifications contained herein at any time without notice Elantec Inc assumes no responsibility for the use of any
circuits described herein and makes no representations that they are free from patent infringement
Elantec Inc
1996 Tarob Court
Milpitas CA 95035
Telephone (408) 945-1323
(800) 333-6314
Fax (408) 945-9305
European Office 44-71-482-4596
WARNING
Life Support Policy
Elantec Inc products are not authorized for and should not be
used within Life Support Systems without the specific written
consent of Elantec Inc Life Support systems are equipment in-
tended to support or sustain life and whose failure to perform
when properly used in accordance with instructions provided can
be reasonably expected to result in significant personal injury or
death Users contemplating application of Elantec Inc products
in Life Support Systems are requested to contact Elantec Inc
factory headquarters to establish suitable terms
conditions for
these applications Elantec Inc 's warranty is limited to replace-
ment of defective components and does not cover injury to per-
sons or property or other consequential damages
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